Certain 2-(o-aminophenyl)-tetrahydrobenzotriazole compounds



United States Patent 3,197,475 CERTAIN 2-(0-AMINOPHENYL)-TETRAHYDRO- BENZOTRIAZOLE COMPOUNDS Rudolph A. Carboni, Wilmington, Del., assignor to E. I. du Pont de Nemours and Company, Wilmington, DeL, a corporation of Delaware No Drawing. Filed Mar. 12, 1962, Ser. No. 179,200

Claims. (Cl. 260308) This invention relates to new compositions of matter, to methods of using them, and to certain compositions of matter containing them.

The new compositions of this invention correspond to the formula:

wherein R is hydrogen or an acyl group free of aoetylenic unsaturation, i.e., an acyl group in which any unsaturation is ethylenic or aromatic; each of R and R", which can be the same or different, contains less than 19 carbon atoms and is an alkyl group, an alkoxy group, or an electronegative group; R can additionally be an alkenylene group which forms an extended aromatic structure of 10-14 ring carbons with the 2-aryl ring; and m and n can be the same or different and are each cardinal numbers of less than 5, i.e., 0, 1, 2, 3, or 4. When In and/or n is less than 4, the respective unsubstituted position(s) on such ring or rings bear(s) hydrogen.

In the above formula, the carbocyclic ring on the left is saturated, i.e., it is cycloaliphatic, While that on the right is benzenoid. Thus, the compounds are referred to as 2 (o-aminophenyl)-2,l,3-(4,5,6,7-tetrahydrobenzotriazoles) and their monoamides.

Examples of alkyl groups containing less than 19 carbon atoms are ethyl, propyl, hexyl, octyl, decyl, dodecyl, tetradecyl, octadecyl, and the like. Exemplary alkenylene groups are butadienylene and benzbutadienylene. Suitable alkoxy groups include ethoxy, propoxy, butoxy, heptyloxy, decyloxy, tetradecyloxy, octadecyloxy, and the like. Illustrative electronegative groups are halo (chlorine, fluorine, and bromine, i.e., halogen of atomic number 9-35), nitro, sulfo, sulfo alkali metal salts (S0 alkali metal), cyano, carboxy, and the like.

The term acyl is used herein in a generic sense to refer to organic groups formed by removal of the OH group from the acidic moiety of carboxylic, sulfonic, and phosphonic acids, especially those of less than 19 carbons. Thus, the term acyl group free of acetylenic unsaturation refers to groups such as the formyl group; carbonyl, sulfonyl and phosphonyl groups, wherein the organic moiety attached to acyl carbon, sulfur or phosphorus, as the case may be, is a hydrocarbon group free of acetylenic unsaturation, e.g., alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl, alkaryl, aralkenyl and aralkyl, or a substituted hydrocarbon group free of acetylenic unsaturation, e.g., any of the above hydrocarbon groups bearing substituent(s) selected from the group consisting of halogen of atomic number 9-35, nitro, amino, hydroxy, alkoxy, and carboxy (especially carboxy-substituted carbonyls, e.g., any of the above carbonyls wherein the hydrocarbon or substitutedhydrocarbon group bears a carboxy group); and also refers to such groups as alkoxyoxalyl; alkoxycarbonyl alkylene carbonyl, i.e.,

3,11%,475 Patented July 27, 1965 alkoxycarbonyl cyclopentylene or cyclohexylene carbonyl,

alkoxycarbonyl phenylene carbonyl, i.e.,

ll HNC-phenylene-C and \N T on 0 Erwin Specific examples of acyl groups are formyl; propionyl, butyroyl, valeroyl, capryloyl, tridecanoyl, octadecanoyl, ethanesulfonyl, butanesulfonyl, decanesulfonyl, tetradecanesulfonyl, methanephosphonyl, butanephosphonyl, methylhexanephosphonyl, and heptanephosphonyl; acryloyl, crotonoyl, methacryloyl, propene-l-sulfonyl, a-ethacryloyl, c=-butacryloyl, a-octaacryloyl, and l-octadecenoyl; cyclobutyroyl, hexahydrobenzoyl, cyclohexanesulfonyl, cyclohexanephosphonyl, and cyclooctanoyl; cyclohexenoyl; benzoyl, benzenesulfonyl, benzenephosphonyl, naphthoyl, and naphthalene sulfonyl; toluoyl, o-butylbenzoyl, o-rnethylbenzenesulfonyl, toluenephosphonyl, 2, 4,6-trimethylbenzoyl, fi-methylnaphthoyl, and a-methylnaphthalene sulfonyl; m-phenacryloyl; phenacetyl, l-naphthylacetyl and 2-phenylbutyroyl; o-methylhexahydrobenzoyl, 1,4-dibutylhexahydrobenzoyl, and o-methylcyclohexanesulfonyl; and chloroacetyl, 3,4-dibrornobutenoyl-l, whydroperfluoropropionyl, perfluorobutanoyl, Z-aminocaproyl, a-bromocaproyl, Z-methylr-chlorobenzoyl, 1,6- dibromonaphthoyl, Z-nitropropionyl, p-nitrochlorobenzenesulfonyl, 3,5-dinitrobenzoyl, hydroxyacetyl, w-hydroxybutyroyl, salicyloyl, m-nitrosalicyloyl, methoxyacetyl, w-ethoxybutyroyl, and S-butoxycapryloyl; and malonoyl, succinoyl, adipoyl, phthaloyl, terephthaloyl, o-carboxycyclohexanoyl, monobutoxyadipoyl, monopropoxysuccinoyl, and monodecanoxysuberoyl; and pyridinoyl, pyridinesulfonyl, piperidinoyl, piperidinesulfonyl, ocmethylpyridinesulfonyl, and a-butylpiperidinesulfonyl.

The 2-(o-aminophe'nyl-2,1, 3-(4,5 ,6,7-tetrahydrobenzotriazoles) of this invention, with the exception of the nitro-substituted derivatives (i.e., R and/or R==NO are prepared by the selective, catalytic reduction of the corresponding 2-(o-aminophenyl)-2,1,3-benzotriazoles or dibenzo-l,3a,4,6a-tetraazapentalenes. The nitro derivatives are prepared by nitrating the desired tetrahydrobenzotriazole with a nitrating agent, e.g., nitric acid.

In the catalytic reduction, there can be used any metal known to be active for promoting reduction of the benzene ring. Particularly useful are the noble metals of Group VIII of the Periodic Table. These can be used as free metals, oxides or salts; and they can be unextended or extended on suitable supports, e.g., charcoal, silica, alumina, pumice, kieselguhr, fullers earth, and the like.

The Group VIII noble metals are platinum, palladium, iridium, osmium, rhodium, and ruthenium.

Palladium-on-charcoal is commercially available, and because of this and its effectiveness under mild conditions of temperature and pressure, it constitutes a preferred catalyst.

An amount of catalyst is chosen that will bring about reaction at the desired rate, and between 0.001 and by weight of the 2-(oaminophenyl)-2,1,3-benzotriazole or ibenzo-l,3a,4,6a-tetraazapentalene can be used. When it is desired to effect the reaction at a rapid rate and relatively low temperature, an amount between 0.1% and 10% is desirably employed.

The hydrogenation can be carried out at temperatures up to 150 C., depending upon the particular catalyst used. With palladium, however, temperatures in the range of 25 to 125 C. are satisfactory and the hydrogenation is usually conducted at a temperature within this range.

The reaction pressure is not critical, and the hydrogeneration can be carried out at atmospheric pressure. However, superpressures will ordinarily be used to increase the rate of reaction and yield of desired product. Generally there is no advantage in using pressures above 1500 lbs./ sq. in. and this, therefore, represents a practical upper limit of pressure.

Although it is not essential, the use of a solvent is advantageous and the hydrogenation is generally conducted in the presence of an inert solvent. Desirably, the solvent is an alkanol, particularly a lower alkanol, such as, methanol; an aliphatic hydrocarbon, such as, isooctane, cyclohexane, and the like; an ether, such as, diethyl ether, dioxane, tetrahydrofuran; or a normally liquid aliphatic acid, such as, acetic, and the like. Mixed solvents such as tetrahydrofuran and acetic acid are also satisfactory.

Hydrogenation of Z-(o-aminophenyl)-2,1,3-benzotriazole or dibenzo-1,3a,4,6a-tetraazapentalene in an organic acid medium, e.g., acetic acid, with a noble metal catalyst, e.g., palladium, may produce the N-acylamine of the 2 (o aminophenyl) 2,1,3 (4,5,6,7 tetrahydrobenzotriazole). On the other hand, if the hydrogenation is effected in a neutral medium the free amine will be produced.

The tetrahydrobenzotriazoles wherein R is an acyl group, i.e., the N-rnonoamides, are readily prepared by acylating the amino group of the appropriate benzotriazole prior to reduction, or simultaneously with reduction when either an organic acid or acid anhydride, e.g., acetic acid or acetic anhydride is the acylating agent. Alternatively, acylation can be effected subsequent to reduction in which case, the amino group of the tetrahydrobenzotriazole product is reacted with the acylating agent. In any event, acylation is effected by conventional techniques, e.g., by reacting the free amine group with an acylating agent, preferably in the presence of an acid acceptor, e.g., an alkali metal hydroxide or tertiary amine such as pyridine or triethylarnine.

The acylating agents, whether they be carboxylic, sulfonic or phosphonic acids, anhydrides or acid halides, etc., are employed in an equivalent manner to yield the desired monoamide derivative; and therefore, an example of one type of acylating agent, e.g., a carboxylic acid, is equally illustrative of, e.g., the corresponding sulfonic and phosphonic acids.

Specific acylating agents useful in preparing the N- acylamides of the 2-(o-aminophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazoles) are formic, acetic, and propionic acids, acetic anhydride, acryloyl chloride, methacryloyl chloride, anisoyl chloride, acetyl chloride, w-hydroperfluoropropionyl chloride, perfiuorobutanoyl chloride, 2- nitrocaproyl bromide, a-ethylacryloyl bromide, ot-butylacryloyl chloride, adipyl chloride, sucoinoyl bromide, 4- ethoxybutyroyl chloride, benzoic acid, toluoyl chloride, 3-hydroxypropionyl chloride, benzoyl chloride and bromide, p-tert-butyl benzoyl bromide and chloride, 2- methyl-4-chlorobenzoyl chloride, 3,5-dinitrobenzoyl chloride, caproic acid and anhydride, mcthanesulfonyl chloride, ethanesulfonyl iodide, cyclohexanesulfonyl chloride, butanesulfonyl chloride, o-methylhexahydrobenzoyl chloride, o-nitrohexahydrobenzoyl bromide, 1,2-dicarboxycyclohexane, perfiuoroacetyl chloride, monobromodifluoroacetyl chloride, 3,5-dinitrobenzoyl chloride, phthaloyl chloride, terephthaloyl chloride, sorboyl chloride, dodecanoyl chloride, pyridine carboxylic acid, quinoline carboxylic acid, naphthoyl chlorides, ,B-methylnaphthoyl chloride, octadecanoyl bromide, diethyl oxalate, and the like.

In effecting the N-acylation with monoacylating agents, the acylating agent and amine are used in chemically equivalent amounts. On the other hand, when a diacylating agent is used, two chemically equivalent proportions of the amine are employed for the 2:1 product and one equivalent for the 1:1 product, e.g., a carboxycarbon amide.

The methods of preparing the starting materials that are essential to prepare the products of this invention are illustrated by the following examples.

The 2-(o-aminophenyl)-2,1,3-benzotriazoles are the products obtained in accord with assignees copending applications, U.S. Serial No. 13,432, filed March 8, 1960, and now abandoned, and US. Serial No. 173,806, filed February 16, 1962. These 2-(o-aminophenyl)-2,l,3 benzotriazoles are conveniently made in one of two ways:

(1) By the oxidation of o,o-diaminoazobenzene in a nitrogen-containing medium, using selected oxidizing agents.

(2) By the reductive ring cleavage with a chemical reducing agent of dibenzo-l,3a,4,Ga-tetraazapentalene.

o,o-Diaminoazobenzene is a known compound and its conversion to 2-(o-aminophenyl)-2,1,3-benzotriazole in a nitrogen-containing medium is illustrated below:

To a solution of 2.2 g. (0.01 mole) of o,o'-diaminoazobenzene in 25 ml. of pyridine there is added gradually 6.4 g. (0.04 mole) of anhydrous cupric sulfate at room temperature with stirring. The mixture is then heated for one hour on a steam bath with stirring, cooled, and poured into four volumes of ice water. The mixture is thereafter extracted with two -ml. portions of diethyl ether. The combined extract is decolori zed with activated carbon, dried over anhydrous sodium sulfate, and evaporated to dryness. The yellow residual oil obtained solidifies to a crystalline mass on cooling. The solid is collected with the aid of petroleum ether and amounts to 13 g. This product melts at '97" to 98 C. and analyzes:

Analysis.-Calcd. for C H N C, 68.55%; H, 4.79%; N, 26.65%. Found: C, 68.55%; H, 4.98%; N, 26.56%.

The ultraviolet light spectrum shows maxima at 3570 A. (e 9650), 2960 A. (5 12,000), 2680 A. (e 6300), and 2290 A. (6 20,400).

The infrared spectrum shows bands at 2.98 3.10 1, and 6.10/1. which indicates presence of the NH function, and bands at 10.3,a, characteristic of a Z-arylbenzotriazole nucleus.

The above data, taken with the fact that diazotization followed by treatment with sodium azide produces 2-(0- azidophenyl)benzotriazole, Ml. 77 to 78 C., confirms that the compound is Z-(o-aminophenyl)-2,l,3-benzotriazole.

The procedure described above is equally applicable to the preparation of substituted 2-(o-aminophenyl)-2,1,3- benzotriazole derivatives. Thus, o-phenylenediamines which contain substituents, such as alkyl, alkoxy, fluorochloro, bromo, sulfo, sulfo alkali metal salt, carboxy, etc., may be oxidized to the corresponding o,o'-diamino-azobenzenes with PbOg. The second oxidation to yield the appropriate benzotriazoles is then carried out as described above., e.g., with cupric sulfate in pyridine or ammonium hydroxide.

Dibenzo-1,3a,4-6a-tetraazapentalene is prepared from o,o'-diazidoazobenzene as described in the co-assigned application for reissue (US. Serial No. 115,859, filed June 2, 1961) of US. Patent No. 2,904,544, now Re. 25,238, as follows:

To 700 ml. of decalin there is added 8.2 g. of o,o-di azidoazobenzene, prepared as described subsequently, the mixture is heated to 160 C., and then maintained at 1'60 to 180 C. for 2.5 hours. The decalin solution is concentrated to 75 ml. under reduced pressure, whereupon long yellow needles of dibenzo-1,3a-4,6a-tetraazapentalene separate, M.P. 237 to 238 C.

The infrared spectrum shows absence of N-H 01 N functions. The general spectral features are in agreement with the assigned structure.

The ultraviolet spectrum shows three main peaks at 2545 A. (6 65,500), 3225 A. (e 4,575), and 4020 A. (6 40,000). The product analyzes:

Analysis.Calcd. for C H N C, 69.22%; H, 3.87%; N, 26.91%; M.W., 208. Found: C, 69.06%; H, 3.99%; N, 26.96%; M.W., 221.

The o,o'-diazidoazobenzene used in the above experiment is prepared as follows:

To a stirred mixture of 4.3 g. (0.02 mole) of o,o'-diaminoazobenzene in 40 ml. of concentrated hydrochloric acid and 40 ml. of water, at 5 0., there is gradually added 4.0 g. (0.058 mole) of sodium nitrite in 20 ml. of water. The insoluble amine hydrochloride gradually dissolves as the diazonium salt forms. The mixture is stirred at 5 C. for an additional hour. Urea is then added to destroy any excess nitrous acid. Sodium azide (3.8 g., 0.06 mole) in 20 ml. of water (5 C.) is slowly added with stirring. Nitrogen is evolved and a colored solid precipitates. The mixture is stirred for 30 minutes at 5 C. and for two hours at room temperature. The solid o,o-diazidoazobenzene has a melting point, with dec., of 107 to 108 C. and the infrared spectrum is consistent with the assigned structure.

Analysis.Calcd. for C12H5N3I C, 54.54%; H, 3.05%; N, 42.41%. Found: C, 54.75%; H, 3.31%; N, 42.37%.

The chemical reduction of dibenzo-1,3a,4,6a-tetraazadride in 75 ml. of tetrahydrofuran there is slowly added a solution of 2.0 g. of dibenzo-1,3a,4,6a-tetraazapentalene in 200 ml. of tetrahydrofuran. The mixture is stirred for one hour without external heating, and then is refluxed for four hours. Excess lithium aluminum hydride and lithium derivatives are decomposed first with alcohol and then with water. The mixture is thereafter extracted with methylene chloride. Evaporation of the extract yields 2-(o-aminophenyl)-2,1,3-benzotriazole, identified by infrared spectral analysis.

As is disclosed in the aforesaid application for reissue, substitution products of dibenzo-1,3a,4,6a-tetraazapenta lene are readily prepared by treating the latter with a halogenating or sulfonating reagent, e.g., chlorine or chlorosulfonic acid. Such reagents do not degrade the ring system because it is highly stable. The substituted dibenzo-1,3a,4,6a-tetraazapentalenes are then converted to the corresponding 2-(o-aminophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazoles) by the process described above.

Substituted dibenzo 1,3a,4,6a-tetraazapentalenes are also prepared from the corresponding substituted 0,0- diaminoazobenzenes, i.e., diaminoazobenzenes which contain substituents such as alkyl, alkoxy, carboxy, fluoro, chloro, bromo, etc. These substituted diaminoazoben- 'zenes can be converted to the corresponding diazides and then to the corresponding substituted dibenzo-1,3a,4,6atetraazapentalenes by the procedure described above for the parent (unsubstituted) compound. The latter derivatives may then be converted to the corresponding product of this invention by either procedure described above.

The 2-(o-aminophenyl)-2,1,3--(4,5,6,7 tetrahydrobenzotriazoles) of this invention in contrast to the parent 2-(oaminophenyl)-2,1,3-benzotriazoles are colorless and this is a very useful characteristic. This characteristic together with their opacity to actinic light in the ultraviolet region, i.e., in the 1200 to 4000 A. wavelength renders these compounds uniquely useful in protecting light sensitive or light-fugitive materials against degradation by such light. These compounds have the ability to stabilize not only dye molecules but also polymer molecules, two very dissimilar types of materials.

Synthetic polymers, modified natural polymers, and mixtures of such polymers are widely used in the protective coating, foil wrapping, and textile industries.

Many polymers fail prematurely when exposed intermittently or continuously to actinic light and much effort has been devoted to the solution of this problem. One of the simplest solutions is through incorporation of actinic light-opaque materials.

The compounds of this invention efiectively protect polymers against deterioration by actinic light, and thus, are highly valuable photostabilizers. For this purpose up to 10% by weight, and generally from 0.0001 to 5% by weight, of the Z-(o-aminophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazole), or N-acyl derivative, is normally used. The incorporation of these compounds into the polymer is eifocted by conventional blending procedures.

The examples which follow illustrate but do not limit this invention.

EXAMPLE I A mixture of 2-(o-aminophenyl)-2,1,3-benzotriazole, 1.3 g., 25 ml. of acetic acid, and 100 mg. of 10% palladium-on-carbon is reacted with hydrogen in a pressure reactor with agitation at room temperature (ca. 22 C.), and 40 lbs/sq. in. pressure for five hours. The theoretical 2 molar equivalents of hydrogen is absorbed during this period. The mixture is filtered to remove the catalyst, the filtrate is subjected to evaporation to remove most of the solvent, the residue is treated with dilute aqueous sodium carbonate solution, and then extracted with diethyl ether. The ether extract is dried, and the ether removed by evaporation. There remains an oily residue that sets to a crystalline mass on cooling. Recrystallization from petroleum ether yields transparent crystals of Z-(o-aminophenyl)2,1,3-(4,5,6,7-tetrahydrobenzotriazole), M.P. 7880 C.

Analysis.-Calcd. for C H N C, 67.26%; H, 6.59%; N, 26.16%. Found: C, 67.43%; H, 6.51%; N, 26.06%.

The ultraviolet spectrum shows maxima at 320 ma (6 7200), 269 ma (6 9610), and 238 m (9 20,500). This spectrum remains essentially unchanged after 80 hours exposure to the intense light of the Fade-Ometer, indicat- 7 aminophenyl)-2,1,3-(4,5,6,7 tetrahydrobenzotriazole) is obtained.

Similarly, when the above example is repeated using the dibromo derivative of 2-(o-aminophenyl)-2,1,3-benzotriazole, the corresponding dibromo-substi-tuted 2-(o-aminophenyl)-2,11,3 (4,5,6,7 tetrahydrobenzotriazole) is ob- 'tained.

Treatment of the above dibromo derivative or the dichloro derivative of Example 11, below, with Cu(CN) at a temperature of about 200 C. yields the corresponding dicyano derivative in each instance. Hydrolysis of th respective dicyano derivatives with aqueous hydrochloric acid readily yields the corresponding dicarboxy-substituted 2(o-arninop-henyl) 2,1,3 (4,5,6,7 tetrahydrobenzotriazole). Similar results will be obtained by following the same procedure when other halogen derivatives of 2 aminophenyD-Z,1,3-(4,5,6,7-tetrahydrobenzotriazole) are employed.

In the right column of Table I are listed other products of this invention which are readily prepared by substituting the corresponding 'benzotriazole in the left column for 2-(o-arninophenyl)-2,1,3-benzotriazole in the procedure of Example I.

Table 1 Example Compound Hydrogenated Hydrogenation Product II 2-(onrninop-chlorophenyl)- Z-(o-amino-p-chloropheny])- 5(6?)-chloro-2,1,3-benzo- 5(6?)-chloro-2 .1,3-(4,5,6,7- triazole. tctrahydrobenzotriazole) III Z-(o-amiuo-m-carboxy- 2-(o-amino-m-carboxyphenyl)-2,l,3-benzotri' phenyl) 2,l,3-(4,5,6,7- azole. tetrahydrobenzotriazole) 1V Z-(o-amino-m-methyl- 2-(oamino-m-methylphenyl)-4-methyl-2,1,3- phenyl)-4methyl-2,1,3- benzotriazole. (4,5,6,7-tetrahydrobenzot-riazole).

V 2r(domino-p-butylphenyl)- 2-(o-amino-p-butylphenyl)- 0ctadecyl-2,l,3-benzooctadecyl-2,1,3-(4,5,6,7- triazole. tetrahydrobenzotriazole) VI 2-(o-amino-m-ethoxy- 2-(0-arnino-rn-ethoxyphenyl)-butoxy-2,1,3- phenyl)-butoxy-2,1,3- benzotriazole. (4,5,6,7-totrahydrobenzotriazole).

VII 2-(o-aminoxylyl)-x,x-di- 2-(o-aminoxylyl)-x,x-dimethyl-2,1,3benzotrimethyl-2,1,3-(4,5,6,7 azolo. tetrahydrobenzotriazole) VIII 2-(o-arniuo-hexylphenyl)- 2 (o-amino-hexylphenyl)- 2,1,3-benzotriazole. 2,1,3-(4,5,6J-tetrahydrobenzotriazole) IX Z-(o-amino-m-sodium- 2(o-aminophenyl-m-sodiumsulfonatophenyl)-2,1,3- sulfonatophenyl)-2,1,3- benzotriazole sodium (4,5,6,7-tetrahydrobenzo sulfonate. triazole)sodium sulionate.

X 2-[o-(2,1,3-benzotriazoly1)]- 2-[0-(2,1,3-[4,5,6,7-tetrasuccinic acid anilide. hydrobenzotriazolylD] succinic acid anilide.

XI 2-[0-(3,5-dicyano-1-henz- 2-[0-(3,5-dicyano-l-benzamido)phenyl]-2,l,3- amid0)-phenyl]-2,1,3- benzotriazole. (4,5,6,7-tetrahydrobenzotriazole).

XII 2-(o-N-m0no-w-hydroocta- 2-(o-N-mono-whydr0o0tafluorovalerylamidofluorovalerylamidophonyl)-2,1,3-benzotriphenyl)-2,1,3-(4,5,6,7- azole. tetrahydrohenzotriazole).

XIII 2-(o-N-rnono-w-ethoxybu- 2-(o-N-mono-m-ethoxybutyry1arnidophe11yl)-2,1,3- tyrylamidophenyl)-2,1,3- benzotriazole. (4,5,6,7-tetrahydrobenzotriazole).

XIV 2-(o-N-rnonow-hydroxybu- 2-(oN-mono-w-hydroxybutyrylamidophenyl)-2,l,3- tyrylamidophenyl)-2,1,3- benzotriazole. (4,5,6,7-tetrahydrobenzotriazole).

XV 2-(0-N-monocamphorami- 2-(o-N-monocamphoramidophenyl)-2,1,3-benzotridophenyl)-2,1,3-(4,5,6,7- azole. tetrahydrohenzotriazole).

XVI 2-(o-amin0naphthyl)-2,1,3- 2-(o-N-arninonaphthyl)- benzotriazole. 2,1,3,-(4,5,6,7-tetrahydrobenzotriazole).

1 Hydrolysis of this product with aqueous hydrochloric acid readily yields the corresponding sulfo-substituted tetrahydrobcnzotriazole.

drolysis of this product with aqueous hydrochloric acid readily yields the corresponding carboxy-substituted tetrahydrobenzotriazole. EXAMPLE XVII 2-(o-aminophenyl)-2,l,3 benzotriazole (31.5 g.) in 125 due corresponds to a yield of 95%. Recrystallization from hexane gives the tetrahydro derivative, 2-(o-aminophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazole), M.P. 76 C. The infrared spectrum is identical to that from the product in Example I.

ture of 2 (o -I monoacetamidophenyl)-2,1,3-(4,5,6,7-

tctrahydrobenzotriazole) A solution of the amide abtained as above in N-ethylacetamide shows the following absorptions: 300 mu (5 6840), 287 m (6 10,600), 277I1'l 1. (a 12,100). The intensity of these absorptions remains unchanged after 80 hours exposure of the solution in the Pade-Ometer.

EXAMPLE XIX A mixture of 6 g. of 1,3 a,4,6a-dibenzotetraazapentalene, 75 ml. of glacial acetic acid, and 5% palladium-on-carbon catalyst is hydrogenated at lbs/sq. in. hydrogen pressure and C. for three hours. The reaction mixture is filtered, evaporated to dryness, and the oily residue extracted with diethyl ether. After evaporation of the ethereal extract, the remainin oily residue is re-extracted with petroleum ether. This mixture is chromatographed on a commercial nonalkaline alumina using diethyl ether as the developing solvent. Two fractions are isolated. The faster-moving fraction is unidentified; the slower-moving fraction is identified as Z-(o-N-monoacetamidophenyl) 2,1,3 (4,5,6,7- etrahydrobenzotriazole), identical to the product of Example II, by chemical analysis, ultraviolet and infrared spectra.

' EXAMPLE XX To a mixture of 10.7 g. of 2-(o-arninophenyl)-2,1,3- (4,5,6,7-tetrahydrobenzotriazole) and 70 ml. of water is added at ambient temperature, in alternating portions, a total of 14 g. of benzoyl chloride and sutlicient quantities of 20% aqueous sodium hydroxide to maintain alkalinity. The mixture is shaken vigorously during the addition, which requires nearly one hour. After an additional hour, the benzarnido derivative is collected by filtration, washed well with distilled water, and recrystallized from 400 ml. of ethanol, after decolorizing with deactivated carbon. There is obtained 10.6 g. of colorless, hairlike needles, M.P. 146.5147.5 C. The infrared spectrum of this compound shows the single NH absorption and the amide C=O absorption, in accord with the structure of 2 (o N-monobenzamidophenyl)- 2,1,3-(4,5,6,7-tetrahydrobenzotriazole). The ultraviolet spectrum in ethanol shows absorptions at 300 m (e 14,085), 265 m (6 27,- 000), and 233 mu (6 14,850). On hydrolysis of the 2-(0- N monobenzamidophenyl) 2,1,3 (4,5,6,7 tetrahydrobenzotriazole) by refluxing with concentrated hydrochloric acid and ethanol for two hours, the colorless .2-(oaminophenyl) 2,1,3-(4,5,6,7-tetrahydrobenzotriazole) is recovered, M.P. 78.5-79.5 C.

Analysis.Calcd. for C H N O: C, 71.68%; H, 5.70%; N, 17.60%. Found: C, 71.46%; H, 5.74%; N, 17.62%.

EXAMPLE XXI To a solution of 5 g. of 2-(o-aminophenyl)-2,1,3- (4,5,6,7-tetrahydrobenzotriazole) in 100 ml. of methylene chloride is added at ambient temperature 3 g. of methane sulfonyl chloride, followed by triethylamine (3 g.). An exothermic reaction ensues. The clear solution is stirred at room temperature overnight, decolorized with activated carbon, and then shaken with water to remove any amine 1 This is a product of M. Woelm-Eschwege, Germany.

salts. The organic layer is dried over anhydrous magnesium sulfate and evaporated to dryness. The residue is recrystallized successively from 3:1 ethanol-water, aqueous acetic acid, and ethanol. The 2-(o-N-methanesulfonamidophenyl) 2,1,3 (4,5,6,7-tetrahydrobenzotriazole) is obtained as colorless crystals, M.P. 101.8 103.2 C.

Analysis.-Calcd. for C H N O S: C, 53.41%; H, 5.52%; N, 19.17%. Found: C, 52.31%; H, 5.21%; N, 19.31%.

The infrared spectrum is consistent with the structure 2- (o N methanesulfonamidophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazole.

EXAMPLE XXII 10 EXAMPLE XXIII To 20 ml. of trifiuoroacetic anhydride is gradually added 5 g. of Z-(o-aminophenyl)-2,l,3-(4,5,6,7-tetrahydrobenzotriazole). After several minutes, a mass of solid separates. When all of the amino compound has been added, one volume of trifluoroacetic acid is added to give a homogeneous solution. The reaction mixture is stirred at ambient temperature for an hour, then poured into four volumes of ice-water to obtain a colorless solid. Recrystallization from methanol yields white, well-defined crystals (5.25 g.) which melt at 105.2106.0 C. Dilution of the mother liquor with water yields an additional 1.15 g. of product, 2-(o-N-monotrifiuoroacetamidophenyl) -2,1,3-(4,5,6,7-tetrahydrobenzotriazole). The infrared spectrum shows the presence of the NH and C0 of the amide as well as the CF absorption.

Analysis.Calcd. C H N F O: C, 54.19%; H, 4.22%; N, 18.06%. Found: C, 53.04%; H, 4:12%; N, 18.29%.

No loss is observed in the absorption maximum (285 me, 6 19,300) after an n-propyl acetate solution of the product has been exposed in the Fade-Ometer for 80 hours.

The products of the invention listed in the right column of Table II are readily prepared by reacting the com pounds in the left column with the acylating agents listed in the middle column following conventional procedures,

20.35%. e.g. those used In Example XVIII and XXXXIII.

Table 11 Example Compounds acylated Acylating Agent; Acylatlon Product XXIV 2-(o-aminophcnyl)-2,l,3-(4,5, 2-mcthyll-ehloro-benzoyl Z-(o-N-mono-2-methylichloro- 6,7-tetrahydrobenzotriazole. chloride. benzamidophenyl)-2,l,3- (4,5,6,7tetrahydrobenzotrlazole).

XXV 2-(o-amin0-p-chlorophcnyD-5 ethanesulfonyl chloride 2-(o-N-monethancsulfonamido- (6?)-ch1oro-2,1,3-(4,5,6,7- p-chl0rophenyl)-5(6?)-chlcrotetrahydrobenzotriazole). 2,1,3-(4,5,6,7-tetrahydrobeuzotriazole) XXVI 2-(0-amn1ot0lyl)ethyl-2,1,3- dodecanoic acid bromide 2-(o-N-monododecanamidotol- (4,5,6,7-tetrahydrobenzoyl)ethyl-2-l,3'(4,5,6,7-tetratriazole). hyrobenzotriazole).

XXVII 2-(o-a.miuo-n-ethoxy-phenyl) pyridine-B-carboxylic acid"-.. 2-(0-N-monopyridin-3-amid0- butoxy-Z,1,3-(4,5,6,7-tetram-ethoxyphenyl)-butoxy-2, hydrobenzotriazole). 1,1 -(4,?,i,7-tetrahydrobenzoriazo e XXVIII D Y )-2,1,3-(4,5,6, quinoline-4-carboxy1ic acid 2-(o-N-monoquiuolin-4-amido- 7-tetrahydrob cnzotriazole) phenyl) -2,1,3- (4,5,6,7-tetrahydrobenzotriazole).

XXIX 2-(o-aminophenyl)-2,1,3-(4,5, l-naphthoyl chloride 2-(o-N-mouonaphth-l-amido- 6,7-tetrahydrobenzotrizphenyl)-2,1,3-(4,5,6,7-tetrazole. 4 hydrobenzotriazole).

XXX 2-(o-anunophenyl) -2,1,3- terephthaloyl chloride bis[2-(o-tercphthalamido (4,5,6,7-tetrahydr0beuzophenyl)-2,1,3-(4,5,6,7-tetratriazole). hydrob enzotriazole)]*.

XXXI 2-(o-amiuopheny1)-2,l,3- scbacoyl chloride bisPAo-sebacamidophenyb- 4-5-6-7-tet-rahydrobe11zo- 2-1-3-(4-5-6-7-tetrahydrotriazole) benzotrlazole) XXXII 2-(o-aminopheuyl)-2,1,3- hexahydrobenzoyl chloride 2-(o-N-monohexahydrobeuz (4,5,63,7-tetrahydrobenzoamidophenyl)-2,l,3-(4,5,6,7- trlazole tetrahydrobeuzotriazole).

XXXIILM 2-(o-aminophenyl)-2,1,3- stearoyl chloride 2-(oNmonostearamidophen- (4,5,6,7-tetrahydrobenzoyl)-2,1,3-(4,5,6,7-tetratriazole). hydrobenzotriazole).

XXXIV 2-(o-aminopheuyl)-2,l,3- p-anisoyl chloride 2-(o-Nmouoanisam1d0pheu- (4,5,6,7-tetrahydrobeuzoyl)-2,1,3-(4,5,6,7-tetratriazole). hydrobenzotrlazole).

XXXV 2-(o-arnin0phenyl)-2,1,3- o-xylyl sulfonyl chloride 2-(0-N-mo110-2,3-din1ethylu- (4,5,6,7-tetrahydrobenzobenzenesulionamidophentriazole). yl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazole).

XXXV D y 3,5-dinitrobenzoyl chlor1de 2r(0-N-mono-3,5-dinitrobenz- (4,5,6,7-tetrahydrobenzoamidophenyl)-2,1,3(4,5,6,7 triazole) tetrahydrob enzotriazolc) XXXVIL l YD- p-toluenesulfonyl chloride 2-(o-N-mono-p-toluencsuli'on- (4,5,6,7-tetrahydrobenz0- amidophenyl)-2,1,3-(4,5,6,7- triazole) tetrahydrob enzotriazole) XXXV 111-. 2-(o-aminophcnyl)-2,1,3-(4,5, cinnamoyl chloride 2-(o-N-monocinnarnam1d0- 6,Hetrahydrobenzotriazole. pheny1)-2,1,3-(4,5,6,7-

tetrahydrobenzotriaz ole) XXXIX 2-(o-aminophenyl)-2,1,3-(4, phenaeetyl chloride 2-(o-N-monophenacetamido- 5,6,7-tetra-hydrobenzotripheny1)-2,1,3(4,5,6,7- azole) tetrahydrob enzotriazole) XL 2-(o-'unin0pheny1)-2,1,3-(4, methacrylyl chloride 2-(o-N-monomethacrylamido- 5,6,7-tctrahydr0benzotrlaphenyl)-2,1,3-(4,5,6,7- zole tetrahydrobeuzotriazole).

XLI 2-(0-amil10phenyl)-2,1,3-(4, 2-iuroyl chloride 2-(o-N-monoiuramidophenyl)- 5,6,7-tetrahydrobenzotria- 2,1,3-(4,5,6,7-tetrahydroz c. benzotriazole).

XLII 2-(oaminopheuyl)-2,1,3-(4, ethyloxalyl chloride 2-(o-N-monoethyloxam1do- 5,6,7-tetrahydrobenzotriaphenyl)-2,1,3-(4,5,6 ,7- zole). tetrahydrob enzotriazole).

See footnotes at end of table.

Example Compounds acylated Acylating Agent I Acylation Product XLIII 2-(o-aminophenyl)-2,1,3-(4, p-tert.-butyl-benzoic acid 2-(o-N-rnono-p-tert.butyl- 5,6,7-tetrahydrobcnzotriabenzarnidophenyl)-2,1,3- zole. (4,5,6,7-tetrahydroloenzotriazole XLIV 2-(o aminophenyl)-2,l,3-(4, methanephosphonyl 2-(o-N-monomethanephos- 5,6,7-tetrahydrobenzochloride. phonamidophenyl)-2,1,3- triazole. (4,5,6,7-tetrahydrobcnzotriazole).

XLV 2-(o-arninophenyl)-2,l,3-(4, butanephosphonyl ehlorlde Z-(o-N-monobutane-phos- 5,6,7-tetrahydrobenzophonamidophenyl)-2,1,3- triazole). (4,5,6,7-tetra-hydrobenzotriazole).

XLVI 2-(o-aminophenyl)-2,1,3-(4, methylhexanephosphonyl 2-(o-N-monomethylhexane- 5,6,7-tetrahydrobenzochloride. phosphonamidophenyD- triazole). 2,l,3-(4,5,6,7-tetrahydrobenzotriazolc).

*Two equivalent portions of acylating agent are used to obtain the products of Examples XXX and XXXI. When these examples are repeated using one equivalent of acylating agent in each instance, 2-(o-N-monoterephthalamidophenyD-and 2- (o-N-monosebacamidophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotrlazole) respectively,

are obtained. Esterifioation of the carboxyl group in each of these products with an alkanol, e.g., ethanol, butanol or hexanol, will yield the corresponding ester of this invention.

As was stated hereinabove, the new compounds of this 20 those wherein the acyl group is of the formula, R CO- or invention are of the formula:

The preferred R and R" groups are chlorine, bromine, sulfo, SO Na, nitro, :carboxy, cyano, lower alkyl (1 through 7 carbons) and lower alkoxy (1 through 7 carbons). Butadienylene (the divalent radical which forms an extended aromatic structure with the 2-aryl ring) is an additional preferred R group. The electronegative R and R" groups are particularly preferred. Generally in and n will not exceed 2 and preferably both m and n are 0.

Because the acylating agents necessary to prepare them are more readily available, the preferred acyl derivatives of the 2- (o-aminophenyl) -2,l,3,- (4,5 ,6,7-tetrahydrobenzotriazoles) are the 2-(o-carbonamidophenyl)-and 2-(o-sulfonamidophenyl) 2,1,3 (4,5,6,7 tetrahydrobenzotriazoles) wherein the organic moiety attached to the group is alkyl, alkenyl, unsubstituted aryl (aromatic hydrocarbon) of 6-10 ring carbons, cycloalkyl of 5-8 ring carbons; alkaryl, aralkyl 0r aralkenyl, wherein the aryl moiety is aromatic hydrocarbon and contains 6-10 ring carbons; halogen-substituted alkyl or aromatic hydrocarbon groups of 6-10 ring carbons, wherein all halogen atoms are of atomic number 9-35; loweralkoxyalkyl or loweralkoxyaryl wherein the aromatic ring is otherwise unsubstituted and contains 6-10 ring carbons; or a heterocyclic group of up to 14 carbons having 4-9 ring carbons and at most one hetero atom which is either oxygen or nitrogen; and in addition, the carbonamide derivatives wherein the acyl group is loweralkoxyoxalyl;

O y roxyor owera coxy- 2)1sh d 1 ll J3 (CH ii 0 (011;) O H I ll hydroxyor Weralkoxy-C and hydroxyor loweralkoxy-yJ-phenylene-iiand the phosphonic acid amides wherein the acyl moiety is a loweralkylphosphonyl group.

Of the above acyl derivatives, those prepared from acylating agents wherein the organic group bonded to the acidic moiety is composed solely of carbon and hydrogen atoms are most accessible and to this extent most preferred.

The 2 (o-N-carbonamidophenyl)-2,1,3- (4,5 ,6,7,-tetrahydrobenzotriazoles) and the 2-(o-N-sulfonamidophenyl) 2,1,3 (4,5,6,7 tetrahydrobenzotriazoles), particularly R SO R bein a monoethylenically unsaturated acyclic hydrocarbon group of no more than 7 carbon atoms, and R being alkyl, especially alkyl of no more than 7 carbon atoms, constitute a preferred class because of their superior photostabilizing properties. Of special interest are the carbonamides in which the acyl group is derived from an alpha, beta-ethylenically unsaturated carboxylic acid of no more than 7 carbon atoms because they can easily be homopolymerized, or copolymerized with other monomers, to form compositions which can be converted to fibers, films, filaments, and the like of lasting actinic light resistance.

The most preferred individual compound is 2-(o-aminophenyl)-2,1,3-(4,5,6,7-tetrahydrobenzotriazole because it is the parent of many of the compounds of this invention and because of its outstanding photostabilizing properties.

To test the efficiency of the 2-(o-aminophenyl)-2,l,3- (4,5 ,6,7-tetrahydrobenzotriazoles) as light stabilizers, two samples of nylon polymer were prepared. To one sample, 1% by weight of the 2-(o-aminoph-enyl)-2,l,3-(4,5,6,7- tetrahydrobenzotriazole) was added and none was added to the second sample. Each sample was spun to yarn. The samples were then dyed and evaluated for lightfastmess. The results are shown below.

FAB RIOS Hours to 1st Break in Xenon Light Dye Class TAPB* Control Anthraquinone Violet 3RN Acid 20-40 20.0 Aeetamine Orange R Dispersed. 40 20. 0

FILM

Anthraquinone Violet 3RN Acid ca. 80.0 20.0 lontacyl Carmine 2G Acid 5-10 5.0

* 2- (o-aminophenyl) -2,1,3-(4,5,6,7-tetrahydrohenzotriazole) The above-described undyed fihns and fabrics showed no yellow discoloration, in contrast to films and fabrics containing the unhydrogenated benzotriazole, 2- (o-aminophenyl)-2-l,3,-benzotriazole.

2 (o-N-rnethanesulfonamidophenyl) 2,1,3 (4,5,6,7- tetrahydrobenzotriazole was added at the 5% (by Weight) level to a polyvinyl dioxolane solution. Actinic lightopaque films were then cast on glass (approximately 2.4 mil thickness). The tetrahydrobenzotriazole was found to be compatible in this polymer medium. Furthermore, the material did not cause significant retardation in the airdrying time of the film, a highly desirable feature.

Since obvious modifications and equivalents in the invention will be evident to those skilled in the chemical arts, I propose to be bound solely by the appended claims.

13 14 The embodiments of the invention in which an excludrobenzotriazole), wherein R is free of acetylenic unsive property or privilege is claimed are defined as folsaturation and is hydrocarbon of less than 19 carbons. lows: 5. A compound of claim 4 wherein R is monoethyl 1. Acompound of the formula: enically unsaturated acyclic hydrocarbon of up to 7 carbons. H

I 6. 2-(o-aminophenyl)-2,1,3-(4,5,6,7 .tetrahydrobenzo- H C N CC (RI)n triazole).

C X 7. 2-(o-N-monoacetamidophenyl) 2,1,3-(4,5,6,7-tetra- (R)m I (E S (L N C hydrobenzotriazole).

8. 2-(o-N-monobenzamidophenyl)-2,l,3-(4,-5,6,7-tetra H 0 hydrobenzotriazole).

9. 2-(o-N-monoacrylamidophenyl)-2,1,3-(4,5,6,7-tetrahydrob enzotriazole) wherein R is selected from the class consisting of hydrogen and an acyl group free of acetylenic unsaturation; R" contains less than 19 carbons and is selected from the group consisting of alkyl, alkoxy, halogen of atomic Referen es Cited by the Examiner number 9-35, nitro, sulfo, -SO alkali metal, cyano and carboxy; R contains less than 19 carbons and is selected UNITED STATES PATENTS 1t). 2-(o-N monomethanesulfonamidophenyl) 2,1,3- (4,5,6,7-tetrahydrobenzotriazole).

from the group consisting of R and an alkenylene group 2,362,988 11/ 44 QOIIZBtti c a1 260308 Which forms an extended aromatic structure of u to 14 3,07 ,910 1/63 Dl ks n 26045.8

ring carbons with the omatic ring to which it is attached; 3,076,782 2/63 Mom et a1 260-453 and each of m and n is acardinal number less than 5. 3, 4,151 4/63 GI SS et a1. 260146 2. 2-(o-N-R SO NH- hen 1) 2,1,3 /7 letrahy FOREIGN PATENTS drobenzotriazole), wherein R is free of acetylenic unsaturation and is hydrocarbon of less than 19 carbons. 878,363 9/61 Great Bntam' 3. A compound of claim 2 wherein R is alkyl of up to NICHOLAS S RIZZO Prima Examiner 7 carbons. ry

4. 2-(o-N-R C(O)NH-phenyl)-2,1,3 -(4,5,6,7 tetrahy- LEON I. BERCOVITZ, Examiner. 

1. A COMPOUND OF THE FORMULA: 